2014 Chevrolet Camaro ZL1 Convertible First TestMotorTrend MagazineNow, we finally got our hands — and test equipment — on the drop-top version: the 2014 Chevrolet Camaro ZL1 Convertible. Present on our tester was an available six-speed automatic transmission not offered on the Shelby GT500. While the ZL1 coupe with …